Feature/Per-Pet RFID Fountain Drinking Sensors (#92)

[jasoncronje]

Proposed change:

Closes #92.

Adds three per-pet drinking sensors for the Dockstream Smart RFID Fountain (PLWF305), sourced from the wearListV2 API endpoint. Sensors appear under each pet's Home Assistant device:

• Today's Fountain Drinking Count — number of drinking sessions today
• Today's Fountain Water Consumption — total ml today (respects user's water unit preference)
• Today's Fountain Drinking Time — total seconds spent drinking today

How it works

• New device_wear_list(device_sn) method on PetLibroAPI follows the existing 10-second cache pattern used by get_device_real_info and friends.
• Pet.refresh() now also queries wearListV2 for any RFID fountains the pet is bound to, then aggregates per-pet drinking stats (sums across multiple fountains if applicable).
• Three new PL_PetSensorEntity entries in PET_ENTITY_MAP expose the data, with translations for all 13 supported languages.

Shared account handling

getBoundDevices returns empty for shared (non-owner) accounts, so the implementation also falls back to the hub's loaded RFID fountain devices. The wearListV2 response is filtered by petId so only the relevant pet's data is used. This mirrors the workaround pattern recommended in the issue thread.

Edge cases handled

• API returns null for pets that haven't drunk today → treated as 0
• wearListV2 call fails → logged and skipped, pet refresh continues
• Pet bound to multiple RFID fountains → values summed correctly (each fountain is a separate API call so no double-counting)
• Multiple pets share a fountain → 10-second cache deduplicates calls within a refresh cycle

Files changed

• custom_components/petlibro/api.py — new device_wear_list() method
• custom_components/petlibro/pets/__init__.py — updated refresh(), 3 new properties
• custom_components/petlibro/pets/entity.py — 3 new sensor descriptions in PET_ENTITY_MAP
• custom_components/petlibro/translations/*.json — 3 new translation keys across 13 files

Testing

Verified live on a personal HA dev instance with a Dockstream Smart RFID Fountain bound to two cats:

• Pet with active RFID drinking: shows real values (e.g., 5 sessions, 56ml, 210s)
• Pet without drinking activity today: shows 0 (matches Petlibro app behavior)
• Aggregation across multiple fountains works correctly
• 10-second cache avoids duplicate API calls when multiple pets share a fountain

Notes

• Sensors are visible for all pets, not just RFID-bound ones (the existing entity_registry_enabled_default_fn plumbing on pet entities has an or super() fallback that prevents disabling — keeping behavior consistent with other pet entities).
• Built and tested against HA 2026.4.x.

Screenshots

[jasoncronje]

Resolved all conflicts. Since I only have one fountain, I requested that someone else from #92 test with multiple fountains.

[C4-Dimitri]

@FeliGoblin, FYI

[meeowgler]

I have 5 RFID fountains and 5 pets. Using the latest commits to jasoncronje:Feature/RFID-Fountain-Per-Pet-Drinking-Sensors, all 5 of my pets appear correctly and the sums all look correct!

[jjjonesjr33]

Looks good, great work @jasoncronje will load this into a pre-release